Product: Oceanic Excitation Functions
EAMF (OAM) - c20010701 - Version metadata

EAMF (OAM) - c20010701

c20010701

2020-08-12

Global oceanic excitation functions (mass and motion terms)
Ocean model : ECCO (based on MITgcm)
Horizontal domain : 73.5 degrees South to 73.5 degrees North latitude
Horizontal resolution : 1/3 degree at equator to 1 degree at high latitudes by 1 degree longitude
Vertical resolution : 46 levels ranging in thickness from 10 m at surface to 400 m at depth
Boussinesq model? : Yes
Tabulated mass term corrected for volume changes due to steric effects? : Yes

Ocean model forcing :
Surface wind stress : 12-hour NCEP/NCAR reanalysis
Surface heat flux : Daily NCEP/NCAR reanalysis
Surface freshwater flux : Daily NCEP/NCAR reanalysis (freshening only)
Surface pressure : None

Data assimilated : None

File units : milliarcseconds (mas) for chi-x and chi-y, milliseconds (ms) for lod 1. The tabulated date corresponds to the midpoint of the 1-day-long averaging interval.

2. The mean has been removed from the tabulated excitation values.
The mean chi mass term (mas,mas,ms; chi-x,chi-y,lod) = 1.64429607E+06 1.24216963E+06 3.69552452E+04
The mean chi motion term (mas,mas,ms; chi-x,chi-y,lod) = -1.83618729E+01 1.06342330E+01 1.63933228E-01

3. The oceanic excitation functions have been computed from the oceanic angular momenta
by Equation (5) of Gross et al. (2003) and Equation (4) of Gross et al. (2004).

1-day averages

1980-01-02

2002-03-31

8125

MJD, mass_chiX, mass_chiY, mass_LOD, motion_chiX, motion_chiY, motion_LOD

ASCII

Irregular

Geophysical fluids, excitation functions

Gross et al., Atmospheric and Oceanic Excitation of the Earth's Wobbles
During 1980-2000, J. Geophys. Res., vol. 108(B8), 2370, 2003
Gross et al., Atmospheric and Oceanic Excitation of Length-of-Day Variations
During 1980-2000, J. Geophys. Res., vol. 109, B01406, 2004

GGFC Special Bureau for the Oceans

Richard.Gross@jpl.nasa.gov

onLine

ftp://ig2-dmz.gfz-potsdam.de/GGFC-Oceans/CHI/c20010701.chi